It would be interesting if someone ripped out the php/js for the gutenberg editor from wordpress as a compiled .net core wysiwyg-block-based editor for use in other .net core projects.
now if they only made gutenberg stick to wcag 2.1 or Section 508, it could change the world. Otherwise, it's not too different from the Frontpages or NetObjects Fusions of the past
Because you sound like you know a bit about a11y, we could really use a hand. Accessibility meetings are weekly in the Make WordPress.org Slack instance. One of the problems is that Gutenberg's technology is very different than the rest of WordPress core, so some of the a11y contributors to WordPress Core are staying away from code-contributions to Gutenberg because of that (myself included). I've been playing around with node.js a bit to try and contribute, but it's very different than what I'm used to (PHP).